Element for a toy building set



FIG. 1 is a top perspective view of an element for a toy building set showing my new design;

FIG. 2 is a front elevational view thereof, the rear side being identical;

FIG. 3 is a side elevational view thereof, the other side being identical;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an element for a toy building set, as shown and described. 